The Nagler T4 17mm has plenty of eye relief, possibly giving it the nod over the T5 16mm, which is closer to your target magnification but has less eye relief. Both are nice eyepieces.
As for wearing glasses at the eyepiece, my experience is that removing my glasses gives me a substantially better view through the eyepiece. Just as having tracking allows me to see deeper, so does getting the eyeglass lenses out of the way. It's a non-trivial improvement. For night use, I buy cheap single-vision glasses with sturdy frames and attach a lanyard to the temples. Removing the glasses then becomes a matter of dropping them and letting them dangle on my chest, hanging from the lanyard. Putting them back on is equally effortless.
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